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( ( $fred == 42) ? ( $config = 'k1') : ( $config ) ) = 'k2';

( $fred == 42 ) ? ( $config = 'k1' ) : ( $config = 'k2' );

$lo = $hi = 0; 
$x = 7; $mid = 5; 
...

print "lo:$lo hi:$hi";;
lo:0 hi:7